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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_009_153">&nbsp;</a>NAME</h4><blockquote>
strncpy - copy part of a string
</blockquote><h4><a name = "tag_000_009_154">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="string.h.html">string.h</a>&gt;

char *strncpy(char *<i>s1</i>, const char *<i>s2</i>, size_t <i>n</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_009_155">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>strncpy()</i>
function copies not more than
<i>n</i>
bytes (bytes that follow a null byte are not
copied) from the array pointed to by
<i>s2</i>
to the array pointed to by
<i>s1</i>.
If copying takes place between objects that overlap, the
behaviour is undefined.
<p>
If the array pointed to by
<i>s2</i>
is a string that is shorter than
<i>n</i>
bytes, null bytes are appended to the copy in the array
pointed to by
<i>s1</i>,
until
<i>n</i>
bytes in all are written.
</blockquote><h4><a name = "tag_000_009_156">&nbsp;</a>RETURN VALUE</h4><blockquote>
The
<i>strncpy()</i>
function returns
<i>s1</i>;
no return value is reserved to indicate an error.
</blockquote><h4><a name = "tag_000_009_157">&nbsp;</a>ERRORS</h4><blockquote>
No errors are defined.
</blockquote><h4><a name = "tag_000_009_158">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_159">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
Character movement is performed differently in different
implementations.
Thus overlapping moves may yield surprises.
<p>
If there is no null byte in the first
<i>n</i>
bytes of the array pointed to by
<i>s2</i>,
the result will not be null-terminated.
</blockquote><h4><a name = "tag_000_009_160">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_161">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="strcpy.html">strcpy()</a></i>,
<i><a href="string.h.html">&lt;string.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from Issue 1 of the SVID.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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